CR (VI)/CR (III) SPECIATION BY IN SITU ELECTRODEPOSITION ONTO TUBE PRIOR TO
ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY

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MASHKOURI NAJAFI N.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

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Journal: Journal of Sciences, Islamic Republic of Iran Year:2002 | Volume:13 | Issue:2 Page(s): 125-130

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Title

CR (VI)/CR (III) SPECIATION BY IN SITU ELECTRODEPOSITION ONTO TUBE PRIOR TO ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY

Author(s)

MASHKOURI NAJAFI N. | Issue Writer Certificate

Keywords

CHROMIUM SPECIATION; ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY; ELECTRODEPOSITIONQ4

Abstract

A new technique of coupled electrodeposition-electrothermal Atomic Absorption Spectrometry (AAS) method has been developed to study chromium speciation. Speciation of Cr (VI)/Cr (III) is carried out by electrodeposition at uncontrolled applied potentials, followed by removal of spent electrolyte and atomisation. At Eappl = 0.5-10.0 V and using codeposition with Hg (and without Pd coating), only Cr (VI) is reduced to Cr (III) and accumulated as Cr (OH)3 by absorption onto mercury film on the graphite furnace. Total chromium is measured by electrodepositing at 10.0 V without Hg but on the renewable Pd substrate from 0.5 M NaCl and 1% H2SO4. It has been demonstrated that chromium speciation can be achieved in samples of 0.5 M NaCl, using acetate buffer to adjust pH to 4.7. The results also will be given for attempted chromium speciation studies by in situ deposition onto Pd-coated furnace. At all applied voltages between 2.0- 10.0 V in 0.02% H2SO4 Cr (III) is reduced to chromium metal and deposited onto the Pd substrate more efficiently than Cr (VI), but the difference is not sufficient for complete discrimination of two chromium forms. The effect of SO4 2- ion concentration and of pH on the yield of deposition were studied for each form of chromium. It was shown that from 1% H2SO4 both forms of chromium deposited quantitatively. Apart from achieving speciation, background signal due to high concentration of NaCl in the sample was completely eliminated by the proposed technique. At the same time a two-fold improvement in sensitivity of the determination was achieved with respect to the conventional electrothermal AAS technique.

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APA: Copy

MASHKOURI NAJAFI, N.. (2002). CR (VI)/CR (III) SPECIATION BY IN SITU ELECTRODEPOSITION ONTO TUBE PRIOR TO ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY. JOURNAL OF SCIENCES ISLAMIC REPUBLIC OF IRAN, 13(2), 125-130. SID. https://sid.ir/paper/370754/en

Vancouver: Copy

MASHKOURI NAJAFI N.. CR (VI)/CR (III) SPECIATION BY IN SITU ELECTRODEPOSITION ONTO TUBE PRIOR TO ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY. JOURNAL OF SCIENCES ISLAMIC REPUBLIC OF IRAN[Internet]. 2002;13(2):125-130. Available from: https://sid.ir/paper/370754/en

IEEE: Copy

N. MASHKOURI NAJAFI, “CR (VI)/CR (III) SPECIATION BY IN SITU ELECTRODEPOSITION ONTO TUBE PRIOR TO ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY,” JOURNAL OF SCIENCES ISLAMIC REPUBLIC OF IRAN, vol. 13, no. 2, pp. 125–130, 2002, [Online]. Available: https://sid.ir/paper/370754/en

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